threat vs doer

threat and doer both are nouns.

Word	Noun	Adjective	Verb	Adverb
threat	Yes	No	No	No
doer	Yes	No	No	No

As nouns, doer is a hypernym of threat; that is, doer is a word with a broader meaning than threat:

Other hypernyms of threat include actor, worker.

threat (noun)	doer (noun)
a warning that something unpleasant is imminent	a person who acts and gets things done
declaration of an intention or a determination to inflict harm on another
a person who inspires fear or dread
something that is a source of danger